Improve transport safety and log redaction

plugin/core/transport.ts

@@ -1,6 +1,6 @@
 import { WebSocketServer, WebSocket, RawData } from "ws";
 import type { YonexusServerConfig } from "./config.js";
-import type { ClientRecord } from "./persistence.js";
+import { safeErrorMessage } from "./logging.js";
 
 export interface ClientConnection {
   readonly identifier: string | null;
@@ -221,7 +221,7 @@ export class YonexusServerTransport implements ServerTransport {
 
     ws.on("error", (error: Error) => {
       // Log error but let close handler clean up
-      console.error("WebSocket error:", error.message);
+      console.error("[Yonexus.Server] WebSocket error:", safeErrorMessage(error));
     });
 
     if (this.options.onConnect) {